Cylinder-reboring machine.



Q.R. MURPHY.

CYLINDER REBORING MACHINE.

APPLICATION FILED JULY 3. I 9I6.

Patented Oct. 2,1917.

2 SHEETS-SHEET I i QUIIJLAIN R. 'Mnnrn oF BmMNenAi/r, ALABAMA, Assrenon @rione-HALF To ROBERT 'Dfiv'iL-iis, A oil BIRMINGHAM, ALABAMA.

/cYLINDEn-'jnneonne MACNE.

Specification of Letters Patent.

Patelilted1066.2,l 1917,

Application hier-'July e, 1916. semaine. 107,404;

Toall whom/Muay'concewif Be it known that I, (2'U1-nLA'1N Ri `M`URPHY, a citizen of the United States of America, residing at Birn'iingham, inthe :county v'of Jefferson and `State of Alabama, have invented certain new and useful Improve'- ment-'s in lCylinder-Rejl'ioringf Machines, of which the following is-a specification.

My invention relates to apparatus which is particularly 'designed for the boring of automobile cylinder's5 and" h'as for its chief object to design an apparatus that can be mounted/in the motorcylinde'rs and-'op-v erated tov rcbore th'em without requiring the engine to be removed from its bearings.v

Heretofore, in apparatusdesigned for the rebori'ng `yof V'cy`li1-iders, andv especially auto-2 mobile cylinders, it has been necessary to disconnect the cylinders-from their base-and,` aft-er the reboring" operation,y to remou'nt them on 'their base: Thisv is objectionable not I only because it involves considerable used as a bottom .bearing for 'thecentering shaft. 1t is necessary to pro'videme'ans to time and labor inl dism'ou'nt'ing and rel' mounting the motor, but more vespecially because of therdiiiicultyofproperly and accu ratelycentering the cylinders in eXactalin'ement von their base'so'that th-emotor will work with the same v'smoothr'iess as when:

originally assembled:

bored by means of suitable centering 'devices, the .inner end of the shaft takinggits bearing on a rtaper-pinl adjustable on the crank shaft and the upper endofthe *centering shaft taking/its*bearing-onen adjustable b'earing'block on'the upper end 'of the lcylin'e" der. ln order that thecrank shaft may be holdit rigidly against movement and to vthis endy I have 'designed 'a novel means for ,Quickly and feifeetively clampingv the vcrankl shaft aga-inst movement.

Another feature of my invention relates to the adaptation of thefreboringmachine to work where the head room is frequently verylimited` To meet this condition the4 boring hea d7 whichboth 'slides' and 'turns on the' centering shaft, is oofnnectedb'y inter; changeable coupling sleeves of varying lengths to a ratchet drive'and screw feed meha'ni'smf Thies@ ltrhahe'eable 'driving sleeves are preferably half circular in shape soA that they may ,be 'applied as the reboring operation proceeds without"disturbing the cerr'teringr sha'ft'and theyl vincrease in 'length byla Adistance approximatelyequal to the effective' length'yof th'e feed screw.

Another" feature of 4`my vinvention relates to its 'adaptability to boring the rear cylinder when there is'a minimum of bothI head and side room. l arrange th'e top bearing forl thecente'ring shaft'so that for this inner cylinder it can be shifted into" position crosswisefof-tlre "motor'and bolted into position and by working therat'chet from the side and inserting longerdriving sleeves asthe boring' proceeds, I can rebore any cylinder in vautmnobile motors as now designed. The interchangeable' coupling sleeves are pro! vided with novelv 'm'e'a-iisforr quick detachment and 'secure coupling with the'driving and feed mechanism" at one end and the' boring headat the other end'.

My invention also comprises the novel featuresy of "constru'ctionyand arrangements' of pa`r`t's whicliin their preferred embodiment `only are hereinafter y'more arti'e'ular'ly described, and which are v-set"for'th in the appended drawings, in which l lFigure l is a vertical sectional VView throughr two motorcylinders',l the boring apparatus beingf showi'n side elevation in operating position;

Fig. 2 isa cross sectional View of the'bon ing` apparatus taken on the line 22' of Figpl. p

Fig. 3 is a cross section on the'line'3-3 of Fig.' 1. l

Fig.' 4l is a plan View of'FigivLfl with the ratchet drive mechanism' removed.

Fig, 5 is an enlarged detailview of a portion of the centering shaft showing vthe interchangeable driving sleeve uncoupled from its drivingfand driven elements.

Figs. 6y and 7 are" views `vshowing v.the ratchet'drive in plan and side elevation, respectively.

Fig. 8 is a detail view of the ratchet pa-wl.

Similar reference numerals refer to similar parts throughout the drawings.

Inthe preferred embodiment of my 'in' vention, which alone is illustrated, I show crank pins turned thereon for connectionl with the piston rods which with the pistons have been removed. The cylinder heads also have been removed, the same having been attached to the top ends of the cylinders/by bolts passing through the bolt holes 5 in the manner well understood. The cylinder 2 is in the process of being rebored and its crank pin is lshown, in lowered position with the taper centering pin 6 mounted thereon by a clamp collar 7. A centering shaft 8 has a taper bore 9 in the center of its bottom end which is adapted to ft over and be centered by the pin 6. The shaft 8 itself is round and of uniform diameter until it reaches a point near the top en d of the cylinder where 1t has a reduced end 10 (see Fig. 5)*.provided with the feedfscrew threads 11 which continue to a point near its upper end where there is provided a transverse bolt hole to receive a bolt by means of which it isy adapted to be madefast in a V-shaped bear-l ing 12 at the upper Iend'of an overhanging arm 13 mounted upon a curved base plate 14. This base 14 is provided with elongated slots 15 and 151 which receive cap screws 16 whichkarescrewed into the holes 5 opposite the 'cylinder 2. The inner edge of the base 14 is cut away on a curve corresponding to theinterior vcurve of they cylinder so that, when attached, it will notiobstruct the latter overhead. In order to center the shaft 8 in the cylinder 2, I first slip taper blocks 17, as shown in dotted lines Fig. 1, on the ends ofthe shaft and provide them with holes 172I for a wrench to be passed through to engage and tighten the nuts of the clamp collar 7 after the pin on the latter has been centered with the centering of the shaft. The base plate 14 is adjusted by means of its elongatedslots 15 until itsbearing 12 enis then gages the top of the shaft and clamped kin position on the cylinder.

In order to hold the crank .shaft 4 against movement after this centering operation, I provide a rod 18 which is connected by a clamp collar 19 to the' crank pin in line with the cylinder 1 and at the upper end ofv this rod I provide a threaded cross arm.20which is rigid vtherewith and has screwed on its ends f sleeves 21 with their ,outer faces rounded to conform to the curvature of the cylinder. This cross arm is set at right angles to the crank pin and it will be evi# dent by running the sleeves 21 out into engagement with the cylinderfwalls, the T-bar Hment and sowill hold the crank shaft against angular movement. I vprovide a bolt hole in the top of the shaft to receive a screw 22 by which it can be connected in its bearing 12 after the boring mechanism has been mounted thereon.

Having centered the shaft 8 and its top and bottom bearings in relation to the cylinder l, I 4diseng'age the shaft from its bearings and releasethe taper blocks 17, slipping oft the lower block and lifting out the upper block with 'the shaft from der., I then mount a cutter head 23 and its driving mechanism on the shaft and mount the latter onV its bottom bearing 6 and bolt it to its top bearing 12. 'Ihe head 23 is free to turn and slide on the shaft and :is connected by means of a semicircular and interchangeable driving sleeve 24 tov a nut 25 and to thethreaded lower end 26 ofl a collar 27 on which the nut is screwed. The collar 27 is left plain above thel threads to form a bearing Aand is preferably formed integral with a ratchet wheel 28 (see Fig. 7), which has a collar 29above it. I cut an annular groove v30 about'thisupper` collar 29 so as to leave an annular flange 31. A. ratchet arm 32 has riveted to eachy side plates 33 which are spaced to receive thev ratchet wheel between them and have .circular openings therein so as to iit and turn on the collars 27 and 29 on which they are mounted before being riveted to the handle.-

A spring-pressed pawl 34 is mounted in a countersunk recess 35 in the inner end ofithc.l handle 32 and is adapted to engage .the

teeth ofthe ratchet wheel 28. The nut 25 is screwed on to reinforce the lower or driv ingvend of the ratchet collar 26.. A split feed'nut 36 is provided yand adapted yto vmeshwith the feed threads on the vshaft end onev half of the feed nut and a wing nut 39". on its end engages theother feed nut sec` tion; As shown in Fig. *8 the feed nut is provided with a countersu'nk groove 40 to receive the ratchet wheel flange 31 and to interiit in the groove 30 and I interlock the nut with the ratchet preferably by a pin 41, see Fig. 9, driven intovthe lower end of the nut so as to traverse the groove 4 0 and to be received in a notch 42 in the ratchet flange 31. i

yThe semi-cylindrical sleeve 24, forming the interchangeable connection between the`I ratchet drive and the screw feed mechanism on one hand and the boring head 23 on the other, is made semi cylindrical so that it can be remove-:l laferally from the shaft 8 withthe cylinout necessitating the removalofithelratchet mechanism or they disconnectionof the shaft from its bearings. In -oir-der, to provide for a connectionzbetween the ends ofthe driving sleeve 2l and the drivingand driven elements, I provideasa preferred means in the end 26 ofthe collar on the ratchet and in the reinforcing nut 25 thereon a pair of dove-tail notches 44, these notches being formed-after ,the nuthas been run `on and each havingone sloping side Lface. The .sloping faces ofeach pair of vnotches-aneinclined in reverse directions. A- similarpair of notches45 are provided in the cutter head Q3 and these likewise have reversely sloping faces. As seen in Fig. 5, the alining notches 44 and 45 ,are reversed so that the undercut portion of one faces to the right and-the other to the left. Q4 is provided at each end with .a pair of dove-tail lugs 44a and 45a which are so shaped thatthey can be slipped* endwise into the notches 44 and 45 and'whenso inserted they will have one beveled face which I will slope in the kdirection of the beveled face in the notch receiving it. By-this arrangement thesemi-circular sleeve will in'- tert and interlock with the boring head and the ratchet wheel and will then turn with the latter about the centering shaft, servin to both rotate and feed-the center head. After the head has been fed down the length of theathreads 11, by grasping the sleeve 24 and turning it soithat its lugs can be disengaged from the notches 44 and 45, a longer sleeve can be inserted after the split nut has been opened and the nut and ratchet parts together have .beensli'pped up to the top of the :threads 11 on `the centering shaft. The operation can then be repeated and driving` sleeves ofincreasinglengthinsertedl until the wholey cylinder has been bored.

' It will be noted in'FigfQ that the boring head is provided with a tool holder 46 which sets the tool 47 so as to make a draw out,the toolbeing held tov set position by adjusting screws 48 and 49. Such an arrangement of the cutting tool gives a much smoother yaction and avoids any tendency'to chatter which mightresult froma tool setat a forward or radial inclination.

The crank shaft forms the most convenient support for the-bottom bearing pin in all types of motors, but I wish it understood that my invention ycontemplates the .mounting of the bottom bearing pin onzanyxsuitable bearing which is available without requiring the cylinder to be removed. There f full head room exists, the step by step center feed may be dispensed with and the A,general practice in boring machines followed in ref` erence -to the feed of the cutter. These. and other changes which do not depart from the claim in principle may .be` made;y

The semi-circular, sleeve- Having thus described my invention, what I claimaascnew 1 and desire to, secure'byv Lettersy Patent, is y l. A cylinder reboring-.tlevice comprising a cutter carrying` shaft, a top bearing therefor adapted tol be attached on the cylinder and a bottom bea-'ring therefor adapted to be attached onthe 4engine crank shaft, means to adjust-said bearings to center said shaft inA the cylinder, means to hold the crank shaft .against movement, and boring mechanisin on said shaft.

2. An apparatus for reboring a cylinder comprising in combination, a cutter' carrying shafta centering' bearing for the lower end of thecutter shaft, means to mount said bearingon the engine crank shaft, a top bearingpmeans to adjustably mount the top bearing o-n the cylinder, means to center the cutter shaft and itsbearings in axial alinement with the cylinder, and means to hold the crank shaft against movement, substantially as described.

3. VyIn an apparatus for reboring cylinders, in combination, means for engaging and holding the engine crank shaft against movement, a lcuttercarrying shaft, a top bearing-for the cutter shaft-adapted to be mounted-.on-the cylinder, a bottom bearing forthe cutter shaft adapted to be mounted on-the crank shaft inline with the cylinder,

means to center the -cutter carrying shaft.

and `its bearings in the cylinder, means for making fast the bearings in their adjusted positions, and boring mechanism mounted on said cutter shaft.

4. A device for reboring cylinders comprising a non-rotatable cutter carry-ing shaft, adjustable bearings for the shaft, means for alining the shaft'and its bearings axially with the bore of the cylinder, a cut ter head rotatable on and adjustable along the shaft, a feed and drive mechanism for the cutter head, and a detachable driving connectionbetween the feed mechanism and the cutterl head.

5. In a device for reboring cylinders, a

centering shaft having a feed screw at itsupper end, means to mount saidshaft in axial alinement `with the cylinder bore, a

screw feed drive means for the cutter head` mounted onthe ythreaded end of said shaft, a cutter head mounted'to turn on and slide along said shaft, and detachable driving connections lbetween the head vand its operating mechanism and rotatable about said shaft, substantially as described.

6. A device for reboring cylinders comprising a 'fixed centering shaft, means to mount the shaft in axial alinement with the bore of the cylinder, a rotatable driving mechanism for the cutter head mounted on the upperfendof said shaft, screw means tov give said driving mechanism a limited feed axiallyy along theshaft, a cutter head toY mounted to rotate on and slide along the shaft, and detachable 4driving connections disposed between said head and driving mechanism and rotatable about said shaft, substantially as described.

' 7. In a cylinder reboring mechanism, the combination of a cutter'carrying shaft and means to mount it in axial alinement with the bore of awcylinder, a vcutter .mounted to rotate on andy slide along' said shaft, a feeding and driving mechanism lmounted on one end of the shaft and having a feeding travel equal to a part only of the length of said shaft along which the cutter is adjustable,

driving connections, between the cutter head and said feed and driving mechanism, which are detachable to permit a connection of suitable length to be used as the work proceeds, said connections being U-shaped in cross section to fit about and be laterally removable from said shaft.

8. rlhe combination, in a cylinder reboring mechanism, of a boring head, a centering guide shaft for the head, adjustable bearings at each end of the cylinder yto be bored to mount said shaft in the axial center of the cylinder, a feed and drive means for the boring head, feed means being adapted to adjust the head to only a fraction -of its normal workingtravel, detachable driving connections of gradually increasing length adapted successively to connect said feed means and boring head, said feed means comprising a feed nut and a feed screw.'

therefor adapted to give the nut a travel substantially equal to the difference in length between successive driving connections.

9.` In a cylinder reboring device, a nonrotatable shaft, means to mount the shaft concentric with the axial center line of a' cylinder to be bored, la boring head mounted to turn andslide on the shaft, a feed screw at the vtop of the shaft, a nut in threaded -engagement with said screw, a ratchet means to turn the nut, and a curved sleeve detachably connected to the nut and head and forming a driving connection between them.

10. In a cylinder reboring device, a nonrotatable shaft, means to mount the shaft concentric with the axial center line of a cylinder to be bored, a boring head mounted to turn and slide on the shaft, a feed screw at the top of the shaft, a nut in threaded engagement with said screw, a curved sleeve detachably connected to the nut and head and forming a driving connection between them, said sleeve and the parts'it connects having complementary undercut lugs, and socketsadapted to permit an endwise disengaging movement of the sleeve in un coupling. v

11.` In a cylinder boring mechanism, a boring head, a fixed bearing shaft therefor on whichvit turns and slides, a feed Aand drive mechanism, and a semi-cylindrical coupling sleeve having at each end lugs that are reversely undercut on one side, and said head and dri-ve mechanism comprising elements in which are sockets undercut to correspond with said lugs and adapted to permit lthe insertion of the lugs thereinto by an endwise movement of the sleeve on said shaft.

12. In a cylinder reboring means, a boring head, a guide therefor, means to mount the guide concentric with the axial center of a cylinder to be bored, a screw feed means for lthe headk which has an eective travel partway only of the length of the boring head guide, means to lengthen the connection between the head and its feed means after the latter completes the full length of its'advancing travel, a split nut forming part of said screw feed means, and means to open the nut to eect a quick return of the feed meansto its starting point.

13. In a cylinder reboring means, a boring head, means to guide it, driving means to rotateit, means to feed it step by step, and means to increase the length of the connection `betweenfthe head and its feed means after eachstep in its feed. f

14. Mechanism to rebore a cylinder while mounted on its base which comprises in combination,a cuttercarrying shaft adapted to n base below the cylinder, a top bearing for the shaft adapted to be mounted on the cylinder, acutter, and means to turn and feed the cutter.

15. In a cylinder reboring device, a shaft having its upper end reduced and threaded, removable centering blocks mounted on the bottom and reduced top of vthe yshaft and adapted tol center it in a. cylinder, bea-rings to hold said shaft in its adjusted-position, a sectional feed nut working on the reduced end of the shaft and adapted to be opened to provide for yits rapid return movement, a cutter mechanism rotatable on the shaft, driving connections between the nut and cutter mechanism, and a ratchet drive to rotate and feed the nut.

16. Ina reboring apparatus for cylinders, a cutter carrying shaft, a bottombearing for the shaft adjustably mounted on a fixed support below the cylinder, means tovfasten the bearing, centering blocks mounted on and removable from the shaft and adapted to enter the lcylinderv ends and center thein its bottom end, a taper pin having a clamp collar adapted to be engaged and to be adjustable on a fixed bottom bearing inv the cylinder base, a top bearing having an overhanging arm with a V-groove bearing for the top of the shaft, means to fasten the shaft to said bearing, a cutter and its feed and drive mechanism detachably mounted on said shaft.

18. In a cylinder reboring mechanism, a boring mechanism comprising a cutter carrying shaft, a bottom bearing for the shaft, a top overhung bearing comprising an arched standard and a quadrant shaped base upon which the standard is mounted and which is slotted to form elongated holes disposed to be positioned over the adjacent bolt holes for the cylinder head and permit the base to be set lengthwise of the cylin; ders or crosswise between cylinders, the top bearing on said standard being adapted to only partly surround the shaft to permit the lateral detachment of the shaft therefrom, substantially as described.

In testimony whereof I aiiiX my signature.

QUILLAIN R. MURPHY. Witness:

' NoMm WELSH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

